Author Topic: BNM Bolt Probe Problems? (Read 22408 times))

ACZan · « **Reply #60 on:** May 02, 2018, 11:22:19 PM »

Look at page one near the top. I took a photo of that pellet still attached and retracted. Looks like a couple of pellet lengths of room.

Just measured it. Looks like the probe retracts about 5/16 of an inch into the recess back away from the magazine/opening.

ACZan · « **Reply #61 on:** May 02, 2018, 11:27:30 PM »

Pecor,

You're busting me up! That's freakin' funny.

I suggested in the reply that they send me a correctly made breech with a return label for the other one, advanced replacement method. Let's see how they respond to that. We request it all the time in the IT industry with the equipment manufacturers. Sometimes you get some real geniuses there, too.

ACZan · « **Reply #62 on:** May 02, 2018, 11:32:11 PM »

Kmaz,

I would hesitate to compare a rear and a side bolt breech. There shouldn't be much difference, since they have to fit on the same air tube. There might some slight differences. But, you will have to do the same thing I have which is documented in all the photographs I have up loaded.

What do you think, Knife'? I bet your just sitting there eating popcorn and enjoying the show, right?

Kmaz · « **Reply #63 on:** May 02, 2018, 11:44:42 PM »

Quote from: ACZan on May 02, 2018, 11:22:19 PM

Look at page one near the top. I took a photo of that pellet still attached and retracted. Looks like a couple of pellet lengths of room.

Just measured it. Looks like the probe retracts about 5/16 of an inch into the recess back away from the magazine/opening.

Huh... well than I guess you know your problem. I still say it's not the probe but with the breech block machining itself. I'm glad you heard back.
Kris

ACZan · « **Reply #64 on:** May 03, 2018, 12:08:06 AM »

I do have two breeches in hand with the same problem. We need people to chime in with what is different between a good breech and a bad breech. That is where your problem will be. One of the reasons I provided a bolt length for others to compare and hopefully report.

proz83 · « **Reply #65 on:** May 03, 2018, 05:25:27 AM »

Quote from: ACZan on May 02, 2018, 06:49:25 PM

Proz83,

Yes, there is supposed to be an o-ring there as show in my photo uploaded in another topic. But, will put it in here if there is no problem having it in a couple of places. There are some folks who didn't know there was an o-ring in there. You have to look closely as it is hard to see it at times.

thanks ACZan !!to get back to the problem, I also noticed that the pellet is closing the hole at 45%:

Mudbugmitch · « **Reply #66 on:** May 03, 2018, 11:06:43 AM »

OK guys, I took the plunge. Opened up this can of worms and Yep, mine too. Pellet is only loaded at about 50%. Barrel and tp aligned perfectly. Now what ? PM Sergio at aerospace ?

Mudbugmitch · « **Reply #67 on:** May 03, 2018, 11:20:10 AM »

By the way, mine is a rear bolt also.

Mudbugmitch · « **Reply #68 on:** May 03, 2018, 12:05:09 PM »

Just took a pretty good picture. It looks like the probe does not go all the way through the port. I am no machinist, so I will hold my opinions.

rsterne · « **Reply #69 on:** May 03, 2018, 12:36:40 PM »

IMO, everyone who identifies this issue should simply take a photo of the pellet position when loaded in the barrel and send it to BNM.... There is power in numbers, and if it proves to be more than an isolated incident, the manufacturer should react by changing the design....

The difference in position people experience will partly be because of the difference in the depth of the hole in the skirt, pellets with a shallow base will load further, of course.... so it might be a good idea to try a couple of different pellets, and specify which pic goes with which photo.... Note I am not suggesting you should have your pellet choice restricted by the way the bolt probe is made.... but that the information is valuable in diagnosing both the problem and solution....

Bob

Kmaz · « **Reply #70 on:** May 03, 2018, 01:23:09 PM »

Quote from: Mudbugmitch on May 03, 2018, 11:20:10 AM

By the way, mine is a rear bolt also.

Man oh man... that stinks... mines a rear bolt and it completely clears. This is using crosman premiers brown box. Can you do me a favor and measure your bolt? Mine measures 3-5/8" from the tip to the rear. When pulled all the way back how much space between the tip of bolt to the face where the magazine goes? Mine has about 3/32".
Kris

proz83 · « **Reply #71 on:** May 03, 2018, 01:34:53 PM »

mine is a rear bolt also !

Mudbugmitch · « **Reply #72 on:** May 03, 2018, 01:52:27 PM »

Do we have an email address for BNM ?

Mudbugmitch · « **Reply #73 on:** May 03, 2018, 01:55:15 PM »

Mine is 3 5/8" also.

proz83 · « **Reply #74 on:** May 03, 2018, 02:04:27 PM »

sales@bnmproducts.com

Mudbugmitch · « **Reply #75 on:** May 03, 2018, 02:10:03 PM »

Tyvm, sent.

Kmaz · « **Reply #76 on:** May 03, 2018, 02:39:52 PM »

So I just took mine off again and looked the hole thing over. I'm happy with mine.. what bob said is a super valid point on pellet selection. It shouldn't be though. but a really deep pocket where the probe goes can effect it greatly. I guess a redesign is in order.
Kris

Mudbugmitch · « **Reply #77 on:** May 03, 2018, 03:02:57 PM »

I usually use CPHP in 14.3g. I believe that I understand what Bob said, but don't agree with having to change pellets. Shouldn't the probe push every pellet pass the port, if their skirt length is the roughly the same size ?

Kmaz · « **Reply #78 on:** May 03, 2018, 03:18:11 PM »

Quote from: Mudbugmitch on May 03, 2018, 03:02:57 PM

I usually use CPHP in 14.3g. I believe that I understand what Bob said, but don't agree with having to change pellets. Shouldn't the probe push every pellet pass the port, if their skirt length is the roughly the same size ?

I completely agree... it should push the pellets past the port. Not that it should matter but some pellets have a deeper probe pocket than others.

Nvreloader · « **Reply #79 on:** May 03, 2018, 04:38:16 PM »

To add some more info about the pellet seating depths, here is some info on overall lengths and skirt depths etc,
of these pellets, I have on hand.

The bearing lengths (skirt dia to head dia) of the pellets I have, picked from tin, no sorting etc,

Shortest Bearing length
H&N Field Target Trophy============.175"/14.66 grs
H&N Field target Trophy ============.175"/14.66 grs
Benjamin Super Point==============.180"/14.30 grs
Benjamin Hollow Point==============.180"/14.30 grs
Benjamin Pointed Expanding ========= .182"/14.30 grs
Crosman Premier HP ============== .184/14.30 grs
Crosman Premier Piranha============.184"/14.30 grs
Benjamin Domed Magnum ===========.190"/14.30 grs
JSB Match Exact Jumbo Diabolo ========.200"/15.89 grs
JSB Match Diabolo Straton Jumbo =======.200"/15.90 grs
Gamo Platinum===================.200"/9.70 grs
Gamo Red Fire===================.215"/14.50 grs
JSB Match Exact Jumbo Heavy Diabolo====.218"/18.13 grs
Kodiak Tapered Dome===============.240"/21.14 grs
H&N Baracuda Match===============.240"/21.14 grs
H&N Baracuda Match ===============.240"/21.14 grs
Ruger Superpoint=================.246"/16.97 grs
Skenco Newboy Junior==============.260"/20.3 grs
JSB Match Exact Jumbo Monster Diabolo===.268'/25.39 grs
Skenco Newboy Hollow Point==========.282"/20.30 grs
Skenco Ultrashock Hollow Point========.282"/16.66 grs
JSB Match Ultra Shock Heavy Diabolo====.300"/25.39 grs

Longest bearing length-
Shortest bearing length is =.175"
Longest bearing length is = .300"
Difference of .125" in bearing length.
-------------------------------------------------------------------------------------------
Inside depth of skirt, from the bottom of skirt to pellets inside waist, the bolt probe pushes against.

Shortest
Benjamin Super Point =============----.052"
JSB Match Exact Jumbo Monster Diabolo==----.058"
JSB Match Ultra Shock Heavy Diabolo====---.064"
JSB Match Exact Jumbo Heavy Diabolo ===---.065"
Skenco Ultrashock Hollow Point========---.072"
Benjamin Hollow Point =============---.076"
Crosman Premier HP ==============---.084"
Benjamin Pointed Expanding =========---.094"
Benjamin Domed Magnum ==========----.096"
Crosman Premier Piranha ===========---.098
JSB Match Diabolo Straton Jumbo ======---.100"
Kodiak Tapered Dome=============----.108"
H&N Baracuda Match =============----.108"=5.51 Head Dia
JSB Match Exact Jumbo Diabolo =======---.112"
H&N Baracuda Match==============---.112"=5.53 Head Dia
Gamo Red Fire =================----.114"
Skenco Newboy Hollow Point =========---.136"
H&N Field target Trophy ============---.142"=5.54 Head Dia
Skenco Newboy Junior=============----.144"
H&N Field Target Trophy============----.154"=5.55 Head Dia
Ruger Superpoint================----.170"
Gamo Platinum==================---.200"
Longest

Shortest Skirt/base depth = .052"
Longest Skirt/base depth = .200"
Difference of .148" in skirt depth.

HTH,

Tia,
Don

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BNM Bolt Probe Problems?

Author Topic: BNM Bolt Probe Problems? (Read 22408 times))