GTA
Airguns by Make and Model => Benjamin Airguns => Topic started by: HillGSA on October 08, 2015, 05:33:58 PM
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Recently, I got the chance to shoot a .30 cal. Marauder rifle.
The rifle is not mine, so I did not shoot it very much. I did make a short video - I thought I would share. There’s more information in the videos description - click on "show more"
https://www.youtube.com/watch?v=varRqbfzm2M (https://www.youtube.com/watch?v=varRqbfzm2M)
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They are quite a bit of fun...:) I have some work to do to complete the shroud/ldc but once that is done I plan to try it against some tree rats. At full boogie, this one is capable of 13-14 shots with 70 gr cast at 1000 fps. Turned down significantly, it is *VERY* accurate with 44 gr JSB...and more shots too.
cheers,
Douglas
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They are quite a bit of fun... :) I have some work to do to complete the shroud/ldc but once that is done I plan to try it against some tree rats. At full boogie, this one is capable of 13-14 shots with 70 gr cast at 1000 fps. Turned down significantly, it is *VERY* accurate with 44 gr JSB...and more shots too.
cheers,
Douglas
I noticed the accuracy right away too. Those bigger caliber pellets seem to stay the course easier/better than the smaller caliber ones. In comparison, I was missing the metal swinging target with the .30 cal. - noticeably less often.
Maybe leave your .30 cal. at full boogie and use one cast to take out a squirrel - and a couple of deer at the same time ;D
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The new King Heavies seem to fly better in the wind than the 30's. It is a limited data set, but seems to follow the reports of the Heavies having a 20% better BC than the 30 cal pellets. In calm, both will bring giggles over the small groups...some of those, held to 5 shots are very small. The 25 having a BSA barrel, and the 30 packing a .590 OD, 26" twist from TJ's fitted by RTS Machining.
cheers,
Douglas
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The new King Heavies seem to fly better in the wind than the 30's. It is a limited data set, but seems to follow the reports of the Heavies having a 20% better BC than the 30 cal pellets. In calm, both will bring giggles over the small groups...some of those, held to 5 shots are very small. The 25 having a BSA barrel, and the 30 packing a .590 OD, 26" twist from TJ's fitted by RTS Machining.
cheers,
Douglas
So, sounds like if you "had to", pick one over the other, then the .25 would get the nod ?
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Here's a couple of pictures of the rifle :
(http://i1298.photobucket.com/albums/ag60/hillairguncom/IMG_4576_zpsafe2tnqa.jpg)[/URL]
(http://i1298.photobucket.com/albums/ag60/hillairguncom/IMG_4586_zpshwzqgmqd.jpg)[/URL]
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Is this something you are going to modify for others?
I happen to have a extra gen 2 laying about.
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I have noticed the jab pellet gets moved around in moderate to high wind also, more than it should also. Be nice if H/N join the band wagon and develop a .30 cal pellet around the same weight.
By the way, nice build 👍🏻 almost looks like that citrus brand moded out of Florida
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Is this something you are going to modify for others?
I happen to have a extra gen 2 laying about.
This is pretty much a one time deal. I can answer your question in more detail if you would email me at: contacttimhill@gmail.com
Thx
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I have noticed the jab pellet gets moved around in moderate to high wind also, more than it should also. Be nice if H/N join the band wagon and develop a .30 cal pellet around the same weight.
By the way, nice build 👍🏻 almost looks like that citrus brand moded out of Florida
Thanks
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I recently finished my .30 Marauder and it shoots amazing. I used one of Tim's valve and gauge blocks, and the barrel and bolt were done by Roy Weid at Mountain Air same as the gun in Tim's video. The low shot count of 7 and avg fps of 835 might be to low for many, but for drop in parts it makes for a *(&^ of a package!! The 1:26 TJ barrel and 44 JSB's make for a very accurate combo.
Roy does a really nice job on the barrel and bolt. I think the .30 kit from Roy was $250 for the barrel and bolt and a bag of spare bolt probe o-rings. I put the .30 top end on one of my guns with WAR valve and hammer and it shot almost identical numbers. Between 2 different power plants, it was evident that whatever the gun shoots .25 cal 43gr eunjins is about what it will shoot as a .30 with 44 jsb's.
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A thanks to:
PakProtector
and
nappyman
for the heads up - about the .25 cal. JSB heavies, being the more accurate pellet, when compared to the .30 cal. ;)
I just set up this rife for a higher power output ( top rifle in pic ) and will order some of the .25 cal. JSB heavies, to try.
Also; I set up the rifle in the bottom of the picture, yesterday for 25.39 grain pellets, at about 810 fps.
On both of these rifles, the pressure tubes have been shortened 3-3/4" ( 20-3/8" long ) . Now the rifles balance more toward me and have a handier feel to them. They are also a bit quicker to aim and should be easier to carry around for extended periods of time. I know the shot count will probably end up being a bit less, but for me, the handiness will most likely be worth the trade off since I do more shooting while "on the move", not at a bench.
(http://i1298.photobucket.com/albums/ag60/hillairguncom/IMG_4602_zpszshy9jbv.jpg) (http://s1298.photobucket.com/user/hillairguncom/media/IMG_4602_zpszshy9jbv.jpg.html)
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Is this something you are going to modify for others?
I happen to have a extra gen 2 laying about.
I didn't want to sound "covert", just respecting rule #9
Thx
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Tim, What shot count did you get with the "30 cal" and the shortened air reservoir?
Chris
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Tim, What shot count did you get with the "30 cal" and the shortened air reservoir?
Chris
I haven't tested a .30 cal. with the shorter reservoir
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What Hammer spring weight?
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Nice looking marauder.. light too! Do you know where I can buy that pistol grip for the marauder?
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Nice looking marauder.. light too! Do you know where I can buy that pistol grip for the marauder?
Here's one place. Reputable dealer and made in USA.
http://www.rarmsinnovations.com/product/rai-r016-modular-chassis-standard-kit/ (http://www.rarmsinnovations.com/product/rai-r016-modular-chassis-standard-kit/)
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What Hammer spring weight?
The .30 cal. tune was with a hillairgun.com (http://hillairgun.com) hammer spring - rated near 12.5 lbs./inch ( I had some custom made ).
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Was a 17 lb tried? Or would that be too much?
On the .25 it seems to work very good in the marauder?
FANG
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Was a 17 lb tried? Or would that be too much?
On the .25 it seems to work very good in the marauder?
FANG
I only use 12.5 or less in my Marauder rifles.
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Nice looking marauder.. light too! Do you know where I can buy that pistol grip for the marauder?
Thx
The grip stock adapter on the scales is a one of a kind. The other one can be purchased from Crosman.
For the grip itself, you can find them here:
http://www.amazon.com/RUBBERIZED-Ambidextrous-Rubberized-Ergonomic-Compartment/dp/B00JJSJZ8C (http://www.amazon.com/RUBBERIZED-Ambidextrous-Rubberized-Ergonomic-Compartment/dp/B00JJSJZ8C)
For more information, you can check out the reviews.
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http://www.gatewaytoairguns.org/GTA/index.php?action=dlattach;topic=92063.0;attach=127614;image (http://www.gatewaytoairguns.org/GTA/index.php?action=dlattach;topic=92063.0;attach=127614;image)
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It isn't so much the .25 being more accurate. The .300 pellet barrel can deliver them quite well; it is just the .25 King Heavy should have less drift due to the 20% improvement in BC. That the BSA tube works well with the Mk.i Heavies is just coincidental...LOL If it didn't I would be hunting another barrel.
On the spring, going much over 12.5#/inch is not required with a valve with stock throat/sealing diameter. Now if you start with a Gen1, 2263 valve and open its throat to .281 it may want more spring. The OE delrin valve does not like such big throats though. IIRC there is an off-the-rack 21#/inch spring available. I don't like the idea of trusting the OE sear with that kiind of pressure. A custom tool steel one would be of great benefit. O1 should be adequate, but A7 looks ideal...:) Harden, then bake for half an hour at 500F to temper it slightly.
cheers,
Douglas
Springs; 0.480 OD( scroll through to the right OD and 2.5" length, then pick weight by wire diameter) http://www.foxvalleyspring.com/docs/compressionSprings.pdf (http://www.foxvalleyspring.com/docs/compressionSprings.pdf)
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It isn't so much the .25 being more accurate. The .300 pellet barrel can deliver them quite well; it is just the .25 King Heavy should have less drift due to the 20% improvement in BC. though - wouldn't you equate that to better accuracy ? ( unless shooting in a vacuum :) ) That the BSA tube works well with the Mk.i Heavies is just coincidental...LOL If it didn't I would be hunting another barrel.
On the spring, going much over 12.5#/inch is not required with a valve with stock throat/sealing diameter. Now if you start with a Gen1, 2263 valve and open its throat to .281 it may want more spring. The OE delrin valve does not like such big throats though. IIRC there is an off-the-rack 21#/inch spring available. I don't like the idea of trusting the OE sear with that kiind of pressure. A custom tool steel one would be of great benefit. O1 should be adequate, but A7 looks ideal... :) Harden, then bake for half an hour at 500F to temper it slightly.
cheers,
Douglas
Springs; 0.480 OD( scroll through to the right OD and 2.5" length, then pick weight by wire diameter) http://www.foxvalleyspring.com/docs/compressionSprings.pdf (http://www.foxvalleyspring.com/docs/compressionSprings.pdf)
I'm just not a fan of using a hammer spring with a rating any higher than 12.5#/inch - in a Marauder rifle. The extra cocking effort, accelerated wear and tear on the associated components, and the altering of the trigger pull, is not worth it. But then again, I am not going for the record :)
By using my parts, I can get enough ACCURATE shots, with enough power for the task at hand, without stretching the Marauder platform beyond it's comfort zone.
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I think the 160 fpe tune was done with a 15# spring. Not much to wear; the hammer seats in the tube and when properly lubed does not much harm. The bolt-to-breech is even easier to lube than the hammer; no need to worry about changes in viscosity changing delivered hammer energy.
With a valve big enough to make good power at high pressure there needs to be some serious energy to open it. However, switch back to pellets and tune it for a 90 FPE string with 44 gr pellets from 1900 to 1100 psi and it needs not so much spring anymore.
cheers,
Douglas
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Not throwing the 17 lb spring at any one.
15 lb is so close to the 17.
As far as ware? Come on! Marauder replacements are cheap and ready available.
No count of pellets down the pipe with the 17? Yes takes a little more effort to set in battery. But I find the 12 and 15 to be as difficult to cock and set in battery as the 17.
The marauder is not the most freindly cocking gun out there. Easy to short stoke and double load from the factory.
Yes the more spring pressure the worse thing get.
But as any pcp the more hammer spring increase I find it as in a spring gun affects the trigger by design. Both put more pressure on the release of the trigger set.
That is a no brained on both spring guns and pcp. More pressure set to release. No different than heavy spring set ups in the trigger. You as the gunner has to overcome the pressure in that trigger finger.
All depends on the shooter and the knowledge of the said gun.
Not after any record here! Just a lone wolf doing my thing.
Nothing I do or have may meet others expectations. Meets mine!💀