Looks like, technically, it can go either way.

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At least RM is telling you what you're getting. Whether it's what you want or not.

How about that, I just received a reply from Rotometals. It was, yes, I was correct but they were just trying to keep it "simple" for people. Not sure just how that works, but that is the way they do it.

Here's an historical reference from Creedmoor days with correct usage:
In the Annual Report of the National Rifle Association for 1875, General Alexander Shaler (President 1875-1877) reported on experiments with powder charges for long range shooting.

The experiments commenced during the summer 1875 and were concluded that December. The aim was to determine the proper charge of powder to use in long range shooting in the Remington Creedmoor Rifle. Swaged bullets weighing 550 grains were used, and interestingly made of a hard alloy composed of fifteen parts lead and one of tin.

[Incidentally, the Irish were using mercury, antimony and bismuth to harden their bullets - no tin!]

Unless you bought some "1 to 20" from Rotometals and some actual 1 to 20 elsewhere and discovered it made a difference to your rifle during the match.

Oldman1950 wrote on Sep 1^st, 2020 at 5:53pm:


Using an alloy calculator and assuming that 1:25 is 1 part tin to 25 parts lead, to change it to 1:20 (1 part tin to 20 parts lead) requires 2.08oz of tin.

Wayne