I recently added a post about 120 grain Sierra soft point in my 6.5 x 55. I have a further query which is a seperate question, so here goes.
I've measured the OAL on the Sierra 120's last night using a Stoney Point gauge, comparator and digital calipers. My first thought was that in order to touch the lans the bullet needs to stick a long way out of the dummy case.
Having taken an average OAL using the gauge I've subtracted 20 thou of an inch off OAL in order to set the bullet back off the lans. I think Lee reccomends 20 thou for hunting bullets. This distance worked well for the Hornaday SST's that I loaded previously.
At this distance from the lans there is only about 5 to 6 mm of the base of the bullet seated into the case (its difficult to measure accurately). This doesn't seem like enough.
I'm a bit concerned that I won't be able to seat the bullets deep enough to get a proper grip from the neck. I also wonder if it is difficult to seat the bullets true with so little in the case. I'm concerned about roll out.
Alternatively, I'm concerned that if I seat the bullets deeper I won't be able to get them close enough to the lans and acuraccy will suffer as a result.
My rifle is a bog standard factory job (Sako 85) and the chamber dimensions are normal. Its had less than 200 rounds through it so the throat is not eroded. I know that the bullets poke out along way on 6.5 x 55s.
I'd be grateful for some advice on this. Has anyone else had this problem. Do you think I'm trying to get too close to the lans?