I avoided a potential major problem last night.
Might help someone else here, so here goes.

This is a bit long. May be better in reloading, but it crosses over to gunsmithing and more people visit gunsmithing.

Bottom line - Avoid distractions when loading, pay attention to small things, take nothing at face value.

I was loading up a set of the 50 bullets from the Final Finish System for my 338 Hawk. It's 10 bulets each, impregnated with 5 different polishing componds. I used the final finish system on a Remington 700 7mm-08 with good results last spring and have always been disappointed with the amount of cleaning required for the Douglas barrel in 338.

The box of bullets is labeled as 215 grains bullets. Each set is a slightly different shade. They appear to be Sierra boat tails. The instructions say to use a starting load of powder. I have never shot a 215 in my Hawk and I don't know of any data for 215's in the Hawk . It's has a little more space than a 338-06 AI. I have used 58 grains of 4064 with no problems on 200 grain Speers. I see 53 grains of 4064 for a 210 bullet in the 338-06 AI as a starting load. So I picked
53 grains for my Final Finish.

I then take two of the #1 finish bullets and use my split necked case to find the AOL to the lands and back off .050 --- start loading.

I start with the number 1's, then #2's

When I get to seating the #3 bullets, somthing does not seem right. I seat the second one,the seating presuare is not the same. I check the OAL - It's .025 shorter than the #1's and #2's. Maybe I changed the adjustment by mistake. - back off .025 and seat another. Still strange in seating.
Then it hits me -- I am compressing the powder with the #3 bullets, that is the seating pressure difference. So I weigh one of the #3 bullets -- 250 grains -- not 215 like all the others - I checked.

So what would have happened with 53 grains of 4064 and 250 grain bullet. I don't know. Likely close to or slighly over a max load. Nick Harvey lists 52 grains as the max in a 338-06 AI. Not sure how far it is from the lands. My guess is it would have kicked very hard, may have blown the primer or stuck the case. I doubt the action would have let go. It's 98 Vz24.

Bottom line - Avoid distractions when loading, pay attention to small things, take nothing at face value. NO TV, Radio, phone calls, converstaions,...

I could back off to 48 grains with the 250s, and shoot them, but then I have to pull the bullets I have loaded and will likely scrape of the compound. Any way I want proof of the error if the supplier gives me any lip when I call.
BTW - the kit was sealed in shrink wrap until I opened it last night and the only 250 grain 338 bullets I have are flat based, protected point Woodleighs.

I am going to call the makers of the Final Finish System in the morning, to report this.
I'll let you know what I hear from them.

Good observations.

I have had way too many mixed bullets in Hornady boxes and junk bullets mixed in too. I found 7mm's in .277" boxes and many with the plastic meplats that are funny shapes.

Never in five decades of using tens of thousands of Sierra bullets have I found one bad or wrong bullet.

But mix ups can happen with any brand and maybe they did happen with Sierra's and I did not notice it. The mistakes are made by people and people make mistakes.

As to the 250's I think that you would have been ok but your correct to be concerned.

I called the maker of the kit. They apologized, made no excuses, and asked if I was sure all the other bullets were 215s. They are sending me a new set of 215s in the #3 compound.

I am satisfied with the response.