Author Topic: Tech Force 87 (Read 8510 times)

darryl · « **Reply #140 on:** September 01, 2010, 01:49:50 PM »

Guys,
thanks for the tips and support. I'm hoping I'm good with the setup now. It turns out I did install the scope stop correctly. I was aware too that I'd need an offset scope mount to get eye relief for the Bug Buster. I read the reviews on PA. The point of the Bug Buster was to have a compact scope and save a few ounces of weight. In all respects, the scope serves my purpose. Or, it did until I found that the scope mount couldn't hold against the battering from the Beast.

Atchamn, when you ask why I din't call Tech Force, are you referring to Compasseco? I can't find anything about contacting Tech Force except for SAG.

I have an intuition that drilling the receiver will be do-able. I'll let SAG tell me "no". Maybe I'll call Compasseco to see what it knows. I want to regain that one inch of eye relief I've lost.
darryl

Atchman2 · « **Reply #141 on:** September 01, 2010, 02:31:31 PM »

Compasseco has an airgunsmith that does repairs. I'd call them first.

darryl · « **Reply #142 on:** September 01, 2010, 03:13:41 PM »

Well, I called Compasseco and spoke to the gunsmith.

He said there's nothing back there and it should be no problem,and to just measure about an inch from the end of the rifle. Then simply drill a pilot hole and use a self-taping screw. He also added that a lot of people have been suggesting that Compasseco do the same thing for outgoing rifles. (the spring stops at the trigger group). OK I have to wash dishes now.
darryl

darryl · « **Reply #143 on:** September 02, 2010, 02:20:49 PM »

Of course I did something a bit different:

http://www.youtube.com/watch?v=Lw6crcEEBtY
	Small \| Large

tworr · « **Reply #144 on:** September 02, 2010, 03:09:39 PM »

Great Job!!

That seems to be the sure fire way to keep it from moving.

Let us know how it works.

Todd

darryl · « **Reply #145 on:** September 02, 2010, 03:43:55 PM »

Todd,
Thanks for the compliment. I found out I couldn't pause the video recording. It's either play or stop. But I can take the scope off, with the mount then quickly put it back on. I don't know if I can maintain zero by doing that, but i'll play with it for a while and see what's possible. After I'm sure, I'll report back here. I can always add a stop crew or JB-weld the rear-most hole.

I just got back from Wally's place. 500/.22 CPHPs for $6.97. Now to go zero the scope and report back later (well after I go pick up the wife then cook dinner. Yeah. That's right. Manly man here).

darryl

darryl · « **Reply #146 on:** September 03, 2010, 11:21:00 AM »

Well, I didn't loctite the scope , and it's moving about. At least the scope mount is no longer creeping.

Anyway, back to step one: take the scope off, clean the mount and the screws, apply loctite, try again. Meanwhile I am shooting the B30 with open sights and appreciating this little rifle more and more.

darryl

darryl · « **Reply #147 on:** September 05, 2010, 07:58:21 PM »

It appears that the holes for the stops in the scope mount have to be a bit more perfect than I made them. I found this out by mounting the scope, and tossing a few rounds to try and zero the scope. Things are not so bad really, but I like a bit more remaining adjustments than I had once the scope mount was secure. Therefore, I reverted back to using the TF scope stop (looks the same as the one on PA for $10.00). Sure, I'm leaning in a bit more, and the rifle has to be pulled firmly into the shoulder to get proper eye relief. But I have much more scope adjustment, which is what I wanted

Oh, when I say the holes have to be a bit more perfect, I found something odd. Before drilling holes, I had put the scope mount on the rifle, and tightened it down firmly. I thought this would be the perfect to center the holes. It did not work out that way. The holes are a bit off center, which made for the gross amount of adjustment I had to cover. Better to measure twice, drill once. So I'll fill in the holes with JB-Weld, the try again some time in the future. I have removed the video I made. Next time I'l be able to put up a video that will show complete success (and not before that).

Meanwhile, the rifle still smokes, and I've cleaned the barrel as a precaution before my latest round of "zero the scope". I'll check it again after another 100 rounds goes through it. Nice rifle. Heavy. Hard hitting Satisfying.

darryl

Atchman2 · « **Reply #148 on:** September 05, 2010, 08:02:21 PM »

How is it grouping?

darryl · « **Reply #149 on:** September 05, 2010, 09:38:19 PM »

Hi Atchman2,
The 87 is grouping well. I've only run about 15-20 pellets through it in trying to zero the scope. At the short range I shoot, 8-9 yards inside, the groups should be tighter, but I'm sure it's mostly me as I've seen my groups open up the more I shoot. Part of it may be from the smoking/dieseling. I'm talking grouping at about a nickel or slightly more. I can do that with the open sights on the B30. I think I'm real close to stacking pellets with the 87. Just gotta eat them Wheaties first.

I admit I'm not satisfied with having to use TF's scope stop. But it seems that the Accushot Offset scope mount may not be the best ticket for the 87. That or the short eye relief of the Bug Buster may not be optimum for the rifle. This requires some more messing around. To boldly go where...stupid is as stupid does..."So the auto mechanic tells the penguin:looks like you blew a seal". The penguin relies: "No. That's just ice cream".
darryl

darryl · « **Reply #150 on:** September 06, 2010, 08:34:20 PM »

Oh, the incessant tinkering is driving me mad!!! Well, that's a short trip anyway. Today I decided to try to improve my eye relief issue a bit. As you'll recall the Bug Buster has an eye relief of 3 inches. I think less. Recall too, that I went back to using the scope stop that came with the 87, and that doing so aggravated the eye relief situation, causing me to lean forward just a bit uncomfortably to gain the proper eye relief. I went back to the scope stop because I felt using both scope-stop screws on the Accushot offset scope mount threw my sight adjustments too far out of whack for my comfort. Now I've tried a compromise set up. I removed the original scope stop (which came with the rifle). Next I put on the offset scope mount (with the Bug Buster still attached), and used the middle hole (I had drilled in the receiver) to hold the rear stop screw on the offset mount. The rear end of the mount is now about 1/4 inch from where the scope rail begins it's radius turn and becomes unsuitable for holding a scope mount. More importantly the eye relief is a little better. I don't have to pull the rifle so tightly into my shoulder to get proper eye relief. Best of all, is that the POI was not too far off the POA, and easily adjusted for. I've seen my shooting stack pellets initially, then widen as. But I've found that's me doing that. Not the rifle. I do the same thing with the B30 and it's open sights.

I am convinced that the scope is not moving on the 87. Because I've gone away, then come back and the POA and POI are good. If anything, all this can be avoided by not using a Bug Buster on an 87. I was trying to save a bit of weight. But the TF-87 is a heavy beast, though not the heaviest even with a light scope. It needs some sort of support, be it a shooting stick or a bench rest or the sitting cross-legged position, or a bi-pod. I'll have to bulk up to shoot free style.

So there it is. My latest episode in dickin' around with the rifle and a short eye relief scope. I learned something. Lighter is not always better. Measure twice; drill once. The only other thing I might do is to put the... well there I go again!

darryl

darryl · « **Reply #151 on:** September 22, 2010, 09:11:34 AM »

Tworr how about an update on your TF-87 with new chronograph results? Curious as to how it settled out.
darryl

tworr · « **Reply #152 on:** September 22, 2010, 10:21:02 AM »

It's shooting great! Santa needs to bring me a crony though. I haven't shot the TF over the crony in a few weeks. I have to borrow it from a friend and I borrowed it again on Sunday to get my QB results.

This weekend was the first time in three weeks that I've had any real free time and I spent it finishing up my QB.
http://www.gatewaytoairguns.org/GTA/index.php/topic,2705.0.html

darryl · « **Reply #153 on:** September 22, 2010, 11:12:06 AM »

tworr, about that link, all I can say is AWESOME!!!!

tworr · « **Reply #154 on:** September 22, 2010, 11:42:59 AM »

Thank you!! The TF87 is a little "green"

with envy. It will still get used a lot so there is nothing for it to worry about. I'm so happy with both!!

Now I just have to wait for a Vortek kit for the TF87 if they ever make one. Maybe I can afford it by the time it(IF) comes out.

darryl · « **Reply #155 on:** September 22, 2010, 03:11:45 PM »

Mine is going to be a bit "green" too. My refurbished RWS came today. I installed the Bug Buster on it with no problem (yet). Here's my first five-shot group from my little 9-yard indoor range.(I'd rather be lucky than good, since I was shooting only to see where the scope's POA was versus the POI of the rifle. I was aiming for dead center of the target.) I had read that the rifle needed a droop compensator mount, but the Leapers offset mount isn't considered a droop compensator as far as I know.
darryl