marksman wrote:TassieTiger wrote:
My problem now is obviously - my most accurate seating depth is touching the lands and pressure spikes are a real possibility so, do I back off .3 mm and live with slightly decreased accuracy or pull right back to 69.8 and let the projectile jump a couple mm’s - which in my “green horn” mind just seems wrong lol.
you wont get pressure spikes from kissing the lands with your projectile if you are already touching and have no pressure signs
what you may see if your ogives are not identical length and all touching the lands is the occasional flyer as the pressure drops when the bullet does not touch the lands, there is nothing wrong with your projectile touching the lands, even for a hunting rifle, its when you are jamming into the lands that you may get a stuck projectile that stays in the throat when you eject a cases that you do not intend to fire,
good luck with it
bigfellascott wrote:I'd play with the action screws - a fella I knew had trouble getting his 223 Savage to shoot well, I had a fiddle with the action screws (only just lightly tightened the front screw and a little firmer on the rear, also bumped the stock on the butt to make sure the action was fully seated rearward and it went from shooting 1.5in groups to 20c piece groups straight away.
Some firearms don't like to to torqued to death in the stock, I've done the same with my Howas and they seem to shoot pretty well as a rule, I don't over torque any of my action screws.
Might be worth seeing if it makes a diff to your outfit.
SCJ429 wrote:You can try the SST but they do not have a great track record for accuracy. Spinning your lighter bullets fast is only a problem if they have a lot of runout. A 110 grain bullet would be a more likely candidate for this type of problem.. I don't think that is holding you back. I will be interested to see how you go with the SMKs.