I was wondering if anyone uses a shoulder bump gauge for .338LM, could tell me what inner diameter should be?
I have a Hornady comparator body already so I bought the shoulder bump insert recommended for magnum cartridges (.420 ID). This only measures a few mm past the neck at the start of the shoulder though.
Cheers,
Brian.
.338 LM shoulder bump gauge inner diameter?
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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.
Re: .338 LM shoulder bump gauge inner diameter?
There's a Sinclair 'bump gauge insert' that is based on a 20 degree shoulder angle, rather than a diameter.Brian838 wrote:I was wondering if anyone uses a shoulder bump gauge for .338LM, could tell me what inner diameter should be?
I have a Hornady comparator body already so I bought the shoulder bump insert recommended for magnum cartridges (.420 ID). This only measures a few mm past the neck at the start of the shoulder though.
https://www.brownells.co.uk/SINCLAIR-BU ... -749011478
There's also a Giraud comparator, but I can't find out how it indexes - maybe worth asking them.
http://giraudtool.com/338comp.htm
Looks like the SAAMI datum (corresponding to headspace datum) would be .476, but it has no corresponding CIP dimension (being a CIP standardised cartridge).
https://saami.org/wp-content/uploads/20 ... f#page=128
..
Re: .338 LM shoulder bump gauge inner diameter?
Awesome, thank you! I think I will look into the Sinclair insert.rox wrote:There's a Sinclair 'bump gauge insert' that is based on a 20 degree shoulder angle, rather than a diameter.Brian838 wrote:I was wondering if anyone uses a shoulder bump gauge for .338LM, could tell me what inner diameter should be?
I have a Hornady comparator body already so I bought the shoulder bump insert recommended for magnum cartridges (.420 ID). This only measures a few mm past the neck at the start of the shoulder though.
https://www.brownells.co.uk/SINCLAIR-BU ... -749011478
There's also a Giraud comparator, but I can't find out how it indexes - maybe worth asking them.
http://giraudtool.com/338comp.htm
Looks like the SAAMI datum (corresponding to headspace datum) would be .476, but it has no corresponding CIP dimension (being a CIP standardised cartridge).
https://saami.org/wp-content/uploads/20 ... f#page=128
..
Brian.
Re: .338 LM shoulder bump gauge inner diameter?
The bump comparator gauges we manufacture are sized at 11.62mm bore for the .338LM
Re: .338 LM shoulder bump gauge inner diameter?
Ovenpaa wrote:The bump comparator gauges we manufacture are sized at 11.62mm bore for the .338LM
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