Do different brands of GC's matter?

[JeffinNZ]

YES.

Today I tested my 225462 HP bullet at a full 100/110y in my .223 Rem 700. Load is 12gr AR2205/H4227 over a small PISTOL primer (thanks John G) for 2100fps. Here is the resulting groups.

http://img.photobucket.com/albums/v505/JeffinNZ/Shooting%20stuff/100m2254622.jpg

Hornady GC's = 3/4 inch.
Lyman GC's = pattern.

Strange thing is the Lyman checks on the original 225462 over 6gr Green Dot shoot REALLY well.

Just goes to show you need to try all the combinations.

[stubshaft]

The gas checks do not usually matter. You be faced with either the Lyman is coming off in flight ( rare occurence) or because you didn't expand the necks for the lyman gc the case itself may be sizing the bullets under bore diameter. I used to get really lousy accuracy when I used just a flare on the neck. After Buckshot made me an expander for my M die it was like night and day. Did you expand the necks for the GD load?

[JeffinNZ]

I only expand enough to easily seat. The Lymans do not require an expander however the Hornadys do. This suggests the Lymans are a tad short on girth.

[Bret4207]

Yup, something is different between them. It's hard to even measure the difference sometimes, that can screw with your head.

[bobthenailer]

I ve used only hornday gas checks in 7 different calibers with excellent accuracy from every one

[Char-Gar]

My first question is how old are those Lyman checks? Current production Lyman checks are crimp on and I understand made by Hornaday. The older slip on Lyman checks are another matter.

I am a big believer in annealing the checks for use rifles. It makes the checks easier to crimp on and requires far less pressure. In a small 22 cal bullet this could make a difference.

[1Shirt]

Good test, interesting, but would like to see further testing and comparisons. Just me I guess.
1Shirt!:coffee:

[JeffinNZ]

Chargar: the old slip on brass versions.

I believe that the Hornady checks are tighter, seal better and steer better.

[Bret4207]

I've used and still use a lot of the old style Lymans. I think the fit determines your success with the old style. If you have a real loose fit you tend to have problems. A good fit, one where the check isn't at all loose but has firm contact, never seems to give me issues.