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.
Lands to bullet distance.
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All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.
Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.
Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
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Gun Pimp
Re: Lands to bullet distance.
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
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
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