Find the lands (jam point) in semi automatic

[AbeS]

I’m very interested to know how the experienced get their coal. I have managed to get a sd of 8 for my browning bar in 30-06 but the 5 shot group was weak(1.5moa) and I loaded to magazine length or 0.010 shorter than magazine length I should say. I tried to figure out my jam but i just can’t do it with the bullet in the fired case method ( crimping nek with pliers as I don’t have mandrel die) figured I want to fit in the magazine anyway. Would you seat deeper or go longer than mag length? ( I know longer is not ideal but I’d rather load one a time and have the accuracy than be able to load more with less accuracy) if longer how can I get the jam (tight in the lands) for my browning mkiii

Thanks

probably worth mentioning that I’m right on the saami spec max length

 

[NMexJim]

I had one of the first BAR in 7mm. If I wanted reliable feed, I used small base dies. I didn’t need to exceed magazine length to get accurate reloads. The BAR is more of a hunting rifle IMO. Cold shot accuracy might be more important than groups especially if the barrel gets hot.