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Lands to bullet distance.
Posted: Sat Mar 05, 2011 11:11 pm
by TobyH
Does the 'sweet spot' distance between the bullet and the lands change with different powder loads? i.e. does each rifle have a set distance that works for it on a particular bullet type.
I'm hoping that I can set up the optimum distance and then keep that fixed whilst changing powder loads.
Re: Lands to bullet distance.
Posted: Sat Mar 05, 2011 11:52 pm
by Gun Pimp
Toby,
Do all your testing with the bullet(s) about 5 thou. off the lands.
When you find your best load, you can try loading into the lands a few thou. and see if the groups improve.
Don't go too far - five thou. max with heavy neck-tension.
You may notice a slight increase in pressure.
Personally, except for benchrest (where we are using low neck-tension) I never load into the lands.
With benchrest, the idea is - the bullet is pushed back exactly the same amount when you close the bolt - but, you only get this effect with low neck-tension. With the high neck-tension you get with normal dies, the slight variation in bullet-ogive means that you will never get the same situation for each round - that's why I prefer five thou. off.
Don't forget also, our benchrest bullets are hand-made, so more consitent than factory bullets.
Cheers
Vince