Edited - Just loaded 26gr into a 223 case and it's just up to the top of the case shoulder so it's either a full case or slightly compressed depending on your bullet
As for suppliers in the NE most sell anything but!, you can get Viht N140 for £55 - £65 a Kg, Saddler on here is on the Scottish borders and has various Viht powders left from a bulk buy a couple of months ago, he posted on another forum recently,
"As per the header...several tubs of Viht available
These would need to be collected from the Edinburgh/East Lothian area - though the third weekend in October I will be in Chesterfield so will be able to bring powder with me....same applies to the M6 corridor (I can meet at a services on the M6) - or the A1 north of Chesterfield.
The powder can also be transported as far North as Aberdeen.
I have for sale:
1 x N120
1 x N130
3 x N133
1 x N140
1 x N540
£65 per kg tub"
His details are here,
The Stalking Directory