I shoot 6.5 CM and now have two rifles in that caliber- Tikka T3x TAC and Christiansen Arms BA Tactical. I full length size and have planned to use the same brass (Lapua) in each rifle. Now I am questioning that. I check concentricity (at ogive) after each loading. I have been down to averaging < .001 on some loadings (usually 50-80 rounds depending on match) and always average under 0.0014. I have been pleased with that but now its all gone sideways. On my last loading I averaged 0.0021- within that group however I had one at .005 and several at 3 to 4 thou.
The only thing i've changed in my reloading process is lube- I have gone to lanolin from Frankford Arsenal pump spray- can't imagine that would explain it.
Could the problem be that I am now using the same brass in both rifles? The chambers in the two are very different- CA very tight chamber, Tikka very long throat. I have felt that with full length sizing that wasn't the problem but maybe Im wrong. The CA is pretty new as is the brass so the runout problem started about the time I began using same brass in both rifles.
I will appreciate any advice and help,
Thanks, Jim
Sorry, think I posted this in the wrong bucket
The only thing i've changed in my reloading process is lube- I have gone to lanolin from Frankford Arsenal pump spray- can't imagine that would explain it.
Could the problem be that I am now using the same brass in both rifles? The chambers in the two are very different- CA very tight chamber, Tikka very long throat. I have felt that with full length sizing that wasn't the problem but maybe Im wrong. The CA is pretty new as is the brass so the runout problem started about the time I began using same brass in both rifles.
I will appreciate any advice and help,
Thanks, Jim
Sorry, think I posted this in the wrong bucket
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