OzFclass

Hmm, says they should work in my 7 3/4 twist bartlein..... will have a go at hornsby on wednesday. looks like warm and elevated is better than cold and sea level

I'll be trying them in a 6mm SLR later in the year hopefully. Just having issues trying to obtain a left hand chassis, everythig else is good to go.

I use the Sierra 115gn projectile sold as a D-Tac and it shoots quite well in a 7.75T barrel. I reckon a 7.5T would be better. Using them in a Norma XC case.

I'm planning on giving them a go in a 1:8 6x47L as that's all I have left. Marginally unstable so they might fall over at the longs a bit, on the other hand at the shorts it might reduce any dispersion caused by any jacket thickness inconsistencies.

I believe a number of shooters have tried the 8T barrel using 115gn Bergers without success and gave the idea away as there are many other good options for a 6mm.

thanks for the heads up, I won't load many up and if initial results are average or worse then I won't persist.

Rebel105 wrote:I use the Sierra 115gn projectile sold as a D-Tac and it shoots quite well in a 7.75T barrel. I reckon a 7.5T would be better. Using them in a Norma XC case.

Where did you buy the DTAC's from?

Imported from US by my dealer, he may have some in stock if interested and you have the right barrel twist. GAS

I did shoot the 115's for a while. According to my twist calc's they needed a 1-7.7 min. if memory serves me correctly. I made my barrel a 1-7.5 twist. Didn't want to be on the ragged edge. Gun shot great.

I tried the DTAC's previously in a 1-8 twist and was pushing them 3130fps. I could get the 105's to shoot in the .3's but the 115 DTAC's the groups went right away to 1 moa or bigger again going off of memory but my gut feeling was the twist wasn't going to be fast enough and it showed. The Dtac's where a older lot and I didn't care for the consistency in the plastic tip on the bullets either. Maybe the newer ones are better?

Also I feel the 115 Berger's vary to much or to temperamental from lot to lot. One lot would hold 1/3moa at a 1k yards and another lot I couldn't do any better than 3/4moa at a 1k. Same powder, same cases, same lot of primers etc...and at the time when I switched to a different lot the barrel had just over 500 rounds on it. Same thing showed at short range as well.

I dropped back to 105-107gr. bullets and 1-8 twist barrels for the most part with the exception of the 6 Dasher I'm doing on a Rem. 40x action right now. That one is going to be a 1-7.75 twist barrel but still will only be shooting the 105-107gr. bullets.

Later, Frank
Bartlein Barrels

preliminary tests in the 1 in 7 3/4 bartlein were fine. They were grouping a little better than the 105s at the moment which started to give some funny elevations after the barrel had done 100 rounds or so. i probably have the jam wrong.

for the 115s
I tried a few warm loads of 2209 and at 20 deg celsius, 200m elevation and 3000 fps there were no shots out of, say, a 1/2 moa circle at 300m. (with one group about 1") I am going to try 41-42gr 2213 sc at 600m today, but then testing will have to wait for a couple of weeks.

I'm using over 44gns of 2213sc and they hammer the X ring

is that load with 105s or 115s ??

115gn Dtacs, I have experimented with 105's & 108gn prodjies with 2209 powder and they all hammer with the XC case.
Frank quoted he used Dtacs with plastic tip, I never had those, but my Dtacs are only a few years old which are Sierra made. I think the 115gn Bergers have a smaller bearing surface which may causes issues at longer range with 8T or even 7.75T barrels that's why i think the 7.5 T would be my next barrel to try.
Geoff

oh, that makes more sense, we calculated a max load between 41-42gr 2213sc but i am shooting the 6x47 lapua case , NOT the 6xc. It just shows how careful you have to be with this stuff,..... it may be in practice that i can go higher but thats where i will start !

ok the load was fine but there was the odd shot out of group so i think i will stick to the 105grs. I have some hybrids and will give them a run .....