M1888 Trapdoor Back To The Range 3rd Times A Charm

[Patrick Chadwick]

Oddly enough they have a lower POI than the heavier slugs. The larger group are the 405gr bullets. Slightly more recoil

"Slightly more recoil" is the clue. Similar to handguns (where it is more noticeable). While the bullet is travelling down the barrel, the barrel is pivoting upwards, as the axis of the recoil force (= barrel centre line) is above the contact area of the butt. Longer barrel time and/or higher recoil thrust = more rotation = higher POI. The reason why modern designs aim to have all forces acting along the same axis and in line with the buttplate.

BTW. What was the range? It seems that you have a very good Trapdoor.

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[oldfoneguy]

"Slightly more recoil" is the clue. Similar to handguns (where it is more noticeable). While the bullet is travelling down the barrel, the barrel is pivoting upwards, as the axis of the recoil force (= barrel centre line) is above the contact area of the butt. Longer barrel time and/or higher recoil thrust = more rotation = higher POI. The reason why modern designs aim to have all forces acting along the same axis and in line with the buttplate.

BTW. What was the range? It seems that you have a very good Trapdoor.

Thanks for explaining this Patrick. My brother claimed flinching but that just wasn't so. I'm going to wave your post in his face, maybe he'll shut up this one time....but I don't think so.
This was at 100 yards and boy did I get lucky with this one. I've enclosed muzzle area photos. This would be a great bore for a WWII rifle for 130 years old I consider it amazing.

[ssgross]

This would be a great bore for a WWII rifle for 130 years old I consider it amazing.

many trapdoor's have great bores like this from metal protected by a thin glazing of soft lead and/or wax, but with the crown chewed up from cleaning rod wear. At least that's what I found in the ones I've cleaned up, and read other accounts of. Looks like you got still got lucky with an absence of cleaning rod wear. I think I'm going to invest in a crowning tool. I think I saw PTG will make a large diameter round-crown cutter for big bores, with whatever diameter pilot you specify for $65, which can then be turned by hand to set back the crown. I think 1/16 or a bit less will do it on my trapdoors.

[oldfoneguy]

Looks like you got still got lucky with an absence of cleaning rod wear.

I think I'm going to invest in a crowning tool. I think I saw PTG will make a large diameter round-crown cutter for big bores, with whatever diameter pilot you specify for $65, which can then be turned by hand to set back the crown. I think 1/16 or a bit less will do it on my trapdoors.

That's the reason I haven't had a trapdoor until I found this one. I'm all about bore condition and shootability. I have probably looked at roughly 200 of them since the 80's. Every milsurp I own with the exception of my very first from 18 years old has an excellent bore all the way to the muzzle. Fortunately for me unfortunately for my bank account I have found 3 milsurps meeting all my expectations in the last 6 months. A Garand this Trapdoor and a Krag and all together they cost about double what my first car did. I am close to finishing my US cartridge fed martial arms collection however I'm done for this year.