Range Report COP200 Bullets & LilGun

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Re: Range Report COP200 Bullets & LilGun

Postby Hoot » Fri Apr 24, 2015 9:34 pm

Texas Sheepdawg wrote:Hoot, have you done any further testing on this? What's the results of charges over 39 Grains?


No, I haven't yet. Still in the 40s at the peak of the day, but the weather man says starting next week we may see temps in the 60s more often. I froze my butt off shooting in the second round of the local Rimfire BR League yesterday evening. Temp was too cold for the rounds to settle down. We never shot the first round back on the 9th due to gale force winds driving sleet / snow mix into our faces. Such is springtime up here. Once in a while it comes early, but last few years the seasons have all shifted 2-3 weeks later. I do plan on having back at the 450b once I can shoot in my shirt sleeves.

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Re: Range Report COP200 Bullets & LilGun

Postby Texas Sheepdawg » Sat Apr 25, 2015 3:38 am

texrider wrote:Got a few rounds tested with the COPs. Tried 38gr and 40gr of LilGun. Both sets seated to 2.180 COL, BR4 primers, and crimped to .474. 18"-16 twist Trident barrel.

38gr fps
2408
2472 - Ave 2422
2405 - SD 33.39
2403
err

40gr fps
2578
2547 - Ave 2523
2504 - SD 39.00
2509
2479

The 38gr was definitely a better group, but I do need to get a better set up too. Using a old card table with sand bags right now. Probably close to what Sheepdawg had. Guess its a Texas thing. By the way how is the new set up Dawg?

Just out of curiosity what did your brass and primers look like with your 40 grain load? (After firing)
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Re: Range Report COP200 Bullets & LilGun

Postby texrider » Sat Apr 25, 2015 8:00 am

Texas Sheepdawg wrote:
texrider wrote:Got a few rounds tested with the COPs. Tried 38gr and 40gr of LilGun. Both sets seated to 2.180 COL, BR4 primers, and crimped to .474. 18"-16 twist Trident barrel.

38gr fps
2408
2472 - Ave 2422
2405 - SD 33.39
2403
err

40gr fps
2578
2547 - Ave 2523
2504 - SD 39.00
2509
2479

The 38gr was definitely a better group, but I do need to get a better set up too. Using a old card table with sand bags right now. Probably close to what Sheepdawg had. Guess its a Texas thing. By the way how is the new set up Dawg?

Just out of curiosity what did your brass and primers look like with your 40 grain load? (After firing)


Checked my notes.. and didn't put much on those. Just noted that I had pressure signs with flattened primers, ejector marks, and swipes. No before and after length or head measurement. From what I remember I saw enough that I didn't want to try them again, but that was probably because I was getting better accuracy with less. Velocities were also higher than QL showed.
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Re: Range Report COP200 Bullets & LilGun

Postby Texas Sheepdawg » Sat Apr 25, 2015 4:12 pm

That's all I needed to hear. I don't think I'm gonna venture past 39 gr.
Thanx!
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Re: Range Report COP200 Bullets & LilGun

Postby Texas Sheepdawg » Sun Apr 26, 2015 12:54 pm

Okay here they are. The first test of these bullets with my LSC.
Bench time depending on when range dries out enough. Right now, it's too wet to get back there.

image.jpg
COP 200
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Re: Range Report COP200 Bullets & LilGun

Postby Texas Sheepdawg » Fri May 15, 2015 1:46 am

Hoot. During our discussions on the 230 Grain Mag Techs and the Hornady 230GrFMJ FPs, you made an observation that may collide with this bullet. I was just rereading our old discussion and this jumped out at me.
image.jpg
image.jpg (141.12 KiB) Viewed 1243 times



Go here to read more.
viewtopic.php?f=5&t=8633&start=80
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Re: Range Report COP200 Bullets & LilGun

Postby Hoot » Fri May 15, 2015 11:30 am

It's hard to win at this. Bullets with two cannelures are not always a good solution either. Many of the two cannelure bullets have the second one too close to the bullet heel. Trying to crimp into it can sometimes cause the heel to distort and that's the last place you want a bullet to distort as its the last part of the bullet to touch the bore. Second issue is along the same lines, but more to the fact that only seating to bury the rear cannelure does not leave much bullet still in the case. Both can destabilize the bullet and effect accuracy.

I sincerely believe that the lack of tiny groups similar to the FTX family is due to the nature of FMJ's whether round or flat pointed. They're solid metal as opposed to the FTX's with their hollow points. Air weighting less than lead, a 230gr solid bullet will be considerably shorter than a 230gr bullet with a hollow point. Even a hollow point with a plastic ballistic tip in it. Shorter bullets leave less opportunity to experiment with different seating depths. I personally prefer to have a seating depth of 1 caliber, but I've gone a shallow as 1/2 caliber. If you're doing the latter with heavier bullets, its not nearly as performance impacting as lighter bullets since the heavier bullets provide their own resistance to motion once fired, relying less upon the retentivity of the crimp. That's a double edged sword though as the heavier bullets pull more due to momentum when chambering. The exception being the 300gr XTP Mag bullet. If you load it to 2.25 COL, its blunt tip is already into the rifling when it is fully chambers, lessening the tendency for it to pull out further.

I have yet to load and experiment with the Flat Point FMJ's, so I can't say if they fare better for the amount of bearing surface available to seat into the case and subsequently crimp into. The weather got warm, then slid backwards the past couple of weeks. Cold, drizzly, diarrhea weather has ruled lately. At least we don't have drought to deal with. :roll:

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Re: Range Report COP200 Bullets & LilGun

Postby Texas Sheepdawg » Thu May 11, 2017 3:53 pm

Where can we find some more of these?
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Re: Range Report COP200 Bullets & LilGun

Postby Hoot » Thu May 11, 2017 8:16 pm

Texas Sheepdawg wrote:Where can we find some more of these?


PM inbound

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