GGG problem
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- shugie
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GGG problem
I was enjoying myself at 600 yards on Century yesterday with some ammunition I'd made using vihtavuori, the results were more than acceptable, my best score ever and by some margin. But I'd not cooked enough of them , and reverted back to my usual GGG from the range office. I've had consistent results with GGG in my Swing, and was more than surprised to find it was all over the place, one round under the target, and no noticeable grouping. I can understand why it might land in a different place, but would at least have expected them all to land, more or less, in the same place.
I'm puzzled.
I'm puzzled.
Careful now/that sort of thing
- Mattnall
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Re: GGG problem
Changing ammo can have a dramatic affect on group size until the barrel gets mucky with the new fouling. I have found on changing ammo types I need to shoot 5-10 shots before they start grouping anywhere near I know they should.
Could this have been the issue?
Could this have been the issue?
Arming the Country, one gun at a time.
Good deals with Paul101, Charlotte the flyer, majordisorder, Charlie Muggins, among others. Thanks everybody.
Good deals with Paul101, Charlotte the flyer, majordisorder, Charlie Muggins, among others. Thanks everybody.
Re: GGG problem
.......which bullets in the home load? SMK 2215 or 2216 or X? & what NRA GGG? 147 MilSurp or NRA TR 155?
I have seen the MilSurp 147 GGG perform very poor groups vs GGG155 or RG 155
I have seen the MilSurp 147 GGG perform very poor groups vs GGG155 or RG 155
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& my fav chemical is :-) 1,3,7-trimethylxanthine.......... used to kill frogs.... but widely consumed & in vast quantities by the French? Eh?
& my fav chemical is :-) 1,3,7-trimethylxanthine.......... used to kill frogs.... but widely consumed & in vast quantities by the French? Eh?
- shugie
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Re: GGG problem
Home load SMK2156, GGG 155 match. My Swing has a non-standard Border barrel that only really likes 155.
Careful now/that sort of thing
- Pete
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Re: GGG problem
Non-standard barrel? What twist? My Swing has a 1:11 Bartlein and I get the best results with 2155's, or 155 Scenars.
2156's were never as good.
Pete
2156's were never as good.
Pete
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- shugie
- Past Supporter
- Posts: 1602
- Joined: Sun Apr 29, 2012 3:42 pm
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Re: GGG problem
I don't know what the twist is, the only markings on the barrel are GI.309 F.300 Z.3070Pete wrote:Non-standard barrel? What twist? My Swing has a 1:11 Bartlein and I get the best results with 2155's, or 155 Scenars.
2156's were never as good.
Pete
Careful now/that sort of thing
- breacher
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Re: GGG problem
This !!!Mattnall wrote:Changing ammo can have a dramatic affect on group size until the barrel gets mucky with the new fouling. I have found on changing ammo types I need to shoot 5-10 shots before they start grouping anywhere near I know they should.
Could this have been the issue?
Very frustrating too.
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RFD 2043 Cambridgeshire
RFD 2043 Cambridgeshire
- shugie
- Past Supporter
- Posts: 1602
- Joined: Sun Apr 29, 2012 3:42 pm
- Home club or Range: Sperry at Bisley
- Location: near Reading
- Contact:
Re: GGG problem
That's new to me. Could be the explanation, certainly better than anything else I can think of, thanks!breacher wrote:This !!!Mattnall wrote:Changing ammo can have a dramatic affect on group size until the barrel gets mucky with the new fouling. I have found on changing ammo types I need to shoot 5-10 shots before they start grouping anywhere near I know they should.
Could this have been the issue?
Very frustrating too.
Careful now/that sort of thing
- Mattnall
- Site Supporter Since 2016
- Posts: 2858
- Joined: Wed Mar 06, 2013 5:32 pm
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Re: GGG problem
I've found it's particularly bad with 22LR ammo as well. I guess smaller, slower bullets are affected more by the changes.shugie wrote:That's new to me. Could be the explanation, certainly better than anything else I can think of, thanks!breacher wrote:This !!!Mattnall wrote:Changing ammo can have a dramatic affect on group size until the barrel gets mucky with the new fouling. I have found on changing ammo types I need to shoot 5-10 shots before they start grouping anywhere near I know they should.
Could this have been the issue?
Very frustrating too.
Arming the Country, one gun at a time.
Good deals with Paul101, Charlotte the flyer, majordisorder, Charlie Muggins, among others. Thanks everybody.
Good deals with Paul101, Charlotte the flyer, majordisorder, Charlie Muggins, among others. Thanks everybody.
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